These older engine bays are pretty easy to fit 'anything'.
The main challenge is are you staying with carburation or will you go EFI ?
Going turbo with carburation is 'fun'.
Personally, if I was doing this conversion, I would pick a modern engine like something from a Yaris.
Then get all the custom bits made.
The coolest mod that you could ever do is transplant a Prius Engine, but I'm not sure about space.
A 2.0T 3SGTE engine out of say a Caldina would give you a lot of power, but perhaps not a very nice car.
Cheers.
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